/ Dictionary / Index H horologium: Meaning and Definition of Find definitions for: hor•o•lo•gi•um Pronunciation: (hôr"u-lō'jē-um, hor"-), [key] — pl. -gi•a a building supporting or containing a timepiece, as a clock tower. (cap.)the Clock, a small southern constellation between Eridanus and Dorado. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. horologist horology Related Content Daily Word Quiz: modify Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language